| Schedule of Carrying Value of Debt Outstanding |
The carrying value of debt outstanding, net of unamortized debt issuance costs, was as follows at March 31, 2024 and December 31, 2023: | | | | | | | | | | | | | March 31, 2024 | | December 31, 2023 | | (in millions) | | Short-term debt: | | | | | Commercial paper | $ | 250 | | | $ | 871 | | | | | | | Senior notes: | | | | $600 million, 3.850% due October 1, 2024 | 572 | | | 572 | | | Total senior notes | 572 | | | 572 | | | Total short-term debt | $ | 822 | | | $ | 1,443 | | | Long-term debt: | | | | | Senior notes: | | | | $600 million, 4.500% due April 1, 2025 | $ | 599 | | | $ | 598 | | $500 million, 5.700% due March 13, 2026 | 498 | | | 498 | | $750 million, 1.350% due February 3, 2027 | 688 | | | 688 | | $600 million, 3.950% due March 15, 2027 | 537 | | | 537 | | $500 million, 5.750% due March 1, 2028 | 495 | | | 495 | | $500 million, 5.750% due December 1, 2028 | 495 | | | 495 | | $750 million, 3.700% due March 23, 2029 | 590 | | | 590 | | $500 million, 3.125% due August 15, 2029 | 433 | | | 433 | | $500 million, 4.875% due April 1, 2030 | 496 | | | 496 | | $1,250 million, 5.375% due April 15, 2031 | 1,238 | | | — | | $750 million, 2.150% due February 3, 2032 | 744 | | | 743 | | $750 million, 5.875% due March 1, 2033 | 735 | | | 750 | | $850 million, 5.950% due March 15, 2034 | 826 | | | 840 | | $250 million, 8.150% due June 15, 2038 | 261 | | | 261 | | $400 million, 4.625% due December 1, 2042 | 396 | | | 396 | | $750 million, 4.950% due October 1, 2044 | 740 | | | 740 | | $400 million, 4.800% due March 15, 2047 | 396 | | | 396 | | $500 million, 3.950% due August 15, 2049 | 514 | | | 529 | | $750 million, 5.500% due March 15, 2053 | 720 | | | 728 | | $1,000 million, 5.750% due April 15, 2054 | 989 | | | — | | | Total senior notes | 12,390 | | | 10,213 | | | | | | | | | | | | | | | Total long-term debt | $ | 12,390 | | | $ | 10,213 | |
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